oj.uz

답안 #132642

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
132642 2019-07-19T09:19:55 Z Just_Solve_The_Problem Election Campaign (JOI15_election_campaign) C++11
30 / 100
 555 ms 47456 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = (int)1e5 + 7;

vector <int> gr[N];
int n, m;
vector <tuple<int, int, int>> vec;
int tin[N], tout[N], lc[17][N], sz[N];
int tiktak;

void dfs(int v, int pr) {
  tin[v] = ++tiktak;
  lc[0][v] = pr;
  for (int i = 1; i < 17; i++) {
    lc[i][v] = lc[i - 1][lc[i - 1][v]];
  }
  sz[v] = 1;
  for (int to : gr[v]) {
    if (to == pr) continue;
    dfs(to, v);
    sz[v] += sz[to];
  }
  tout[v] = ++tiktak;
}

bool upper(int a, int b) {
  return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int lca(int a, int b) {
  if (upper(a, b)) return a;
  if (upper(b, a)) return b;
  for (int i = 16; i >= 0; i--) {
    if (!upper(lc[i][a], b)) a = lc[i][a];
  }
  return lc[0][a];
}

bool check(int i, int j) {
  int a, b, c, d, val = 0;
  tie(a, b) = make_tuple(get<0>(vec[i]), get<1>(vec[i]));
  tie(c, d) = make_tuple(get<0>(vec[j]), get<1>(vec[j]));
  int lc = lca(c, d);
  if (upper(a, b)) {
    val = (tin[a] <= tin[c] && tin[c] <= tin[b]);
    val ^= (tin[a] <= tout[c] && tout[c] <= tin[b]);
    if (val) return 0;
    val = (tin[a] <= tin[d] && tin[d] <= tin[b]);
    val ^= (tin[a] <= tout[d] && tout[d] <= tin[b]);
    if (val) return 0;
    val = (tin[a] <= tin[lc] && tin[lc] <= tin[b]);
    val ^= (tin[a] <= tout[lc] && tout[lc] <= tin[b]);
    if (val) return 0;
  } else {
    val = (tout[a] <= tin[c] && tin[c] <= tin[b]);
    val ^= (tout[a] <= tout[c] && tout[c] <= tin[b]);
    if (val) return 0;
    val = (tout[a] <= tin[d] && tin[d] <= tin[b]);
    val ^= (tout[a] <= tout[d] && tout[d] <= tin[b]);
    if (val) return 0;
    val = (tout[a] <= tin[lc] && tin[lc] <= tin[b]);
    val ^= (tout[a] <= tout[lc] && tout[lc] <= tin[b]);
    if (val) return 0;
    int lc1 = lca(a, b);
    if (lc1 == a || lc1 == b || lc1 == lc) return 0;
  }
  return 1;
}

int ans;

int solve1() {
  for (int mask = 1; mask < (1 << m); mask++) {
    vector <int> v;
    for (int j = 0; j < m; j++) {
      if ((mask >> j) & 1) {
        v.push_back(j);
      }
    }
    bool ok = 1;
    for (int i = 0; i < v.size(); i++) {
      for (int j = 0; j < v.size(); j++) {
        if (i == j) continue;
        ok &= check(v[i], v[j]);
      }
    }
    if (ok) {
      int res = 0;
      for (int &to : v) {
        res += get<2>(vec[to]);
      }
      ans = max(ans, res);
    }
  }
  return ans;
}

int dp[N];

int solve2() {
  sort(vec.begin(), vec.end());
  int ptr = vec.size() - 1;
  for (int i = n; i >= 1; i--) {
    dp[i] = dp[i + 1];
    while (ptr >= 0 && get<0>(vec[ptr]) == i) {
      dp[i] = max(dp[i], dp[get<1>(vec[ptr]) + 1] + get<2>(vec[ptr]));
      ptr--;
    }
  }
  return dp[1];
}

vector <int> query[N];

int calc(int v, int id) {
  int a, b;
  tie(a, b) = make_tuple(get<0>(vec[id]), get<1>(vec[id]));
  int res = 0;
  while (a != v) {
    for (int to : gr[a]) {
      if (upper(to, get<0>(vec[id])) || upper(to, get<1>(vec[id]))) continue;
      res += dp[to];
    }
    a = lc[0][a];
  }
  while (b != v) {
    for (int to : gr[b]) {
      if (upper(to, get<0>(vec[id])) || upper(to, get<1>(vec[id]))) continue;
      res += dp[to];
    }
    b = lc[0][b];
  }
  for (int to : gr[v]) {
    if (upper(to, get<0>(vec[id])) || upper(to, get<1>(vec[id]))) continue;
    res += dp[to];
  }
  return res;
}

void dfs1(int v, int pr) {
  for (int to : gr[v]) {
    if (to == pr) continue;
    dfs1(to, v);
    dp[v] += dp[to];
  }
  for (int id : query[v]) {
    dp[v] = max(dp[v], calc(v, id) + get<2>(vec[id]));
  }
}

int solve5() {
  for (int i = 0; i < m; i++) {
    query[lca(get<0>(vec[i]), get<1>(vec[i]))].push_back(i);
    //cout << i << ": " << lca(get<0>(vec[i]), get<1>(vec[i])) << endl;
  }
  dfs1(1, 1);
  return dp[1];
}

vector <int > st[N];
int id[N];

void dfs2(int v, int pr) {
  int big = 0;
  for (int to : gr[v]) {
    if (to == pr) continue;
    if (sz[to] > sz[big]) {
      big = to;
    }
  }
  for (int to : gr[v]) {
    if (to == pr || big == to) continue;
    dfs2(to, v);
  }
  if (big) {
    id[v] = id[big];
    dfs2(big, v);
  }
  int ok = -1;
  for (int idd : query[v]) {
    if (ok != -1) break;
    bool res = 1;
    for (int to : gr[v]) {
      res &= (st[id[to]].empty() || (check(idd, st[id[to]].back()) && check(st[id[to]].back(), idd)));
      if (!res) break;
    }
    if (res) {
      ok = idd;
    }
  }
  for (int to : gr[v]) {
    if (to == pr || big == to) continue;
    for (int tto : st[id[to]]) {
      st[id[v]].push_back(tto);
    }
  }
  if (ok != -1) {
    st[id[v]].push_back(ok);
  }
}

main() {
  scanf("%d", &n);
  for (int i = 1; i < n; i++) {
    int u, v;
    scanf("%d %d", &u, &v);
    gr[u].push_back(v);
    gr[v].push_back(u);
  }
  dfs(1, 1);
  scanf("%d", &m);
  for (int i = 0; i < m; i++) {
    int u, v, w;
    scanf("%d %d %d", &u, &v, &w);
    if (tin[u] > tin[v]) swap(u, v);
    vec.push_back({u, v, w});
  }
  if (m <= 15) {
    printf("%d\n", solve1());
    return 0;
  }
  if (gr[1][0] == 2 && (n == 2 || gr[n - 1][1] == n)) {
    printf("%d\n", solve2());
    return 0;
  }
  if (n <= 1000 && m <= 1000) {
    printf("%d\n", solve5());
    return 0;
  }
  for (int i = 0; i < m; i++) {
    query[lca(get<0>(vec[i]), get<1>(vec[i]))].push_back(i);
  }
  dfs2(1, 1);
  printf("%d\n", st[id[1]].size());
}

Compilation message

election_campaign.cpp: In function 'int solve1()':
election_campaign.cpp:83:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < v.size(); i++) {
                     ~~^~~~~~~~~~
election_campaign.cpp:84:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int j = 0; j < v.size(); j++) {
                       ~~^~~~~~~~~~
election_campaign.cpp: At global scope:
election_campaign.cpp:204:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:236:34: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
   printf("%d\n", st[id[1]].size());
                  ~~~~~~~~~~~~~~~~^
election_campaign.cpp:205:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
election_campaign.cpp:208:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &u, &v);
     ~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:213:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &m);
   ~~~~~^~~~~~~~~~
election_campaign.cpp:216:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &u, &v, &w);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7416 KB Output is correct
2 Correct 8 ms 7416 KB Output is correct
3 Correct 8 ms 7416 KB Output is correct
4 Correct 97 ms 7664 KB Output is correct
5 Correct 555 ms 19704 KB Output is correct
6 Correct 101 ms 25776 KB Output is correct
7 Correct 251 ms 23632 KB Output is correct
8 Correct 484 ms 20032 KB Output is correct
9 Correct 321 ms 22392 KB Output is correct
10 Correct 473 ms 20088 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7416 KB Output is correct
2 Correct 8 ms 7544 KB Output is correct
3 Correct 9 ms 7672 KB Output is correct
4 Correct 112 ms 28020 KB Output is correct
5 Correct 122 ms 28144 KB Output is correct
6 Correct 110 ms 28016 KB Output is correct
7 Correct 112 ms 28308 KB Output is correct
8 Correct 112 ms 28104 KB Output is correct
9 Correct 111 ms 28136 KB Output is correct
10 Correct 112 ms 28144 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7416 KB Output is correct
2 Correct 8 ms 7544 KB Output is correct
3 Correct 9 ms 7672 KB Output is correct
4 Correct 112 ms 28020 KB Output is correct
5 Correct 122 ms 28144 KB Output is correct
6 Correct 110 ms 28016 KB Output is correct
7 Correct 112 ms 28308 KB Output is correct
8 Correct 112 ms 28104 KB Output is correct
9 Correct 111 ms 28136 KB Output is correct
10 Correct 112 ms 28144 KB Output is correct
11 Correct 20 ms 8504 KB Output is correct
12 Correct 118 ms 28392 KB Output is correct
13 Correct 116 ms 28328 KB Output is correct
14 Correct 117 ms 28264 KB Output is correct
15 Correct 113 ms 28268 KB Output is correct
16 Correct 113 ms 28236 KB Output is correct
17 Correct 115 ms 28264 KB Output is correct
18 Correct 116 ms 28264 KB Output is correct
19 Correct 114 ms 28200 KB Output is correct
20 Correct 115 ms 28396 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 225 ms 47456 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7416 KB Output is correct
2 Correct 8 ms 7416 KB Output is correct
3 Correct 8 ms 7416 KB Output is correct
4 Correct 97 ms 7664 KB Output is correct
5 Correct 555 ms 19704 KB Output is correct
6 Correct 101 ms 25776 KB Output is correct
7 Correct 251 ms 23632 KB Output is correct
8 Correct 484 ms 20032 KB Output is correct
9 Correct 321 ms 22392 KB Output is correct
10 Correct 473 ms 20088 KB Output is correct
11 Correct 10 ms 7676 KB Output is correct
12 Correct 10 ms 7672 KB Output is correct
13 Correct 10 ms 7672 KB Output is correct
14 Correct 10 ms 7676 KB Output is correct
15 Correct 10 ms 7544 KB Output is correct
16 Correct 10 ms 7672 KB Output is correct
17 Correct 11 ms 7676 KB Output is correct
18 Correct 12 ms 7672 KB Output is correct
19 Correct 10 ms 7672 KB Output is correct
20 Correct 9 ms 7672 KB Output is correct

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7416 KB Output is correct
2 Correct 8 ms 7416 KB Output is correct
3 Correct 8 ms 7416 KB Output is correct
4 Correct 97 ms 7664 KB Output is correct
5 Correct 555 ms 19704 KB Output is correct
6 Correct 101 ms 25776 KB Output is correct
7 Correct 251 ms 23632 KB Output is correct
8 Correct 484 ms 20032 KB Output is correct
9 Correct 321 ms 22392 KB Output is correct
10 Correct 473 ms 20088 KB Output is correct
11 Correct 9 ms 7416 KB Output is correct
12 Correct 8 ms 7544 KB Output is correct
13 Correct 9 ms 7672 KB Output is correct
14 Correct 112 ms 28020 KB Output is correct
15 Correct 122 ms 28144 KB Output is correct
16 Correct 110 ms 28016 KB Output is correct
17 Correct 112 ms 28308 KB Output is correct
18 Correct 112 ms 28104 KB Output is correct
19 Correct 111 ms 28136 KB Output is correct
20 Correct 112 ms 28144 KB Output is correct
21 Correct 20 ms 8504 KB Output is correct
22 Correct 118 ms 28392 KB Output is correct
23 Correct 116 ms 28328 KB Output is correct
24 Correct 117 ms 28264 KB Output is correct
25 Correct 113 ms 28268 KB Output is correct
26 Correct 113 ms 28236 KB Output is correct
27 Correct 115 ms 28264 KB Output is correct
28 Correct 116 ms 28264 KB Output is correct
29 Correct 114 ms 28200 KB Output is correct
30 Correct 115 ms 28396 KB Output is correct
31 Runtime error 225 ms 47456 KB Execution killed with signal 11 (could be triggered by violating memory limits)
32 Halted 0 ms 0 KB -